Lawn-mower sharpener.



M. JOHANSEN. 'LAWN MWER SHARPENER.

Patented Dec. 1'7, 1912.

APPLICATION FILED DBG. 26, 1911.

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@Ze v70-@736623,

i y F147 UNITED sTATEs PATENT (WETGE. 7

` MIKKEL JoHANsEN, or MAPLE'woon MISSOURI.

LAWN-MOWER SHAEPENER.

To all whom t may c0n0ern1'- l K Be it known that I, MIKKEL JoHANsEN, a

citizen of thek United States, andresident of Maplewood, St. Louis county, Missouri, have invented certain new and useful Improvements in Lawn-Mower Sharpeners, of which.

the following is a specification containing a full, clear, and eXact description, reference being had to the accompanying drawings, forming a part hereof.

V My `invention relates to lawn mower Vwill be hereinafter more fully described, set

forth in the claims, and illustrated in the accompanying drawings, in which:

Figure 1 is a top. plan view of a conventional type of lawn mower having my invention applied thereto; Fig. 2 is a transverse section of the mower with my inven# taken on the line 2-2 of Fig. 1; Fig. 3 is a detailed view of a part of the lawn mower frame, showing the Sharpener in end elevation; Fig. 4 is a detion applied thereto,

tailed rear view of a part of the lawn mower` frame and roller, showing my Sharpener applied; and Fig. 5 is an enlarged perspective view of the sharpeningv plate removed from thecasing. i

As heretofore stated, my invention is constructed to be readily attached to and detachedfrom any conventional type of lawn mower, and is made in suitable sizes to fit the various sizes of lawn mowers.

I have shown my invention applied to a` lawn mower of the conventional type, wherein- X l'indicates the wheels,4 2 the axle con necting the wheelathe blades, and 4t the shaft on which the blades are mounted.

5 indicates the'pparts yor members of the mower in which the rollerl'y is mounted,'and

` to which my Sharpener isusuallyjapplied.-

. The Sharpener itself is composed of a'casing 7 provided with ears 8, in which ears 8 yare located set screws 9.` These set screws 9 are passed through the ears or arms8 and are adapted to engage with the outside faces .or surfaces of the parts of the lawn mower frame, and by means of which the Sharpener hesive material.

i is affixed to the mower. The ears v8 are slightly depending, as illustrated` in Fig. 3, and are located on the outside of the members, and the body or casing 7 isprovided with arecvess or cut away portion 10 at each end, in which are seated the members 5, as illustrated in Fig. 4. i Y

speeiveation of Letta-sparen; i' Patetedbecllglg, Application mea December 21s, 1911. serial No. 667,900. l

'The casing? is arranged above theparts or members vwhen the Sharpener is applied y `to the mower, and is practically supported vthereby in a horizontalposition. Mounted in the casing 7`is a follower 11, and mounted y in the 'y rear yof `rthe follower 11 on screw threaded pins 12 are springs .13. The screw threaded pins 12 pass through the casing 7 and are provided with thumb nuts 14. .By this constructionkthe follower 11 -is yieldinglymounted within the casing 7 and by means of the thumb nuts 1,4: the tension on the springs 13 may begregulated, and consequently the be regulated or adjusted.

Mounted in the casing 7'y in front yof the follower l1 is a sharpening block yielding 15, provided on opposite sides with abrasive f or grinding faces 16. The sharpening block is preferably made out of wood and has applied to its opposite'faces a layer or coating yof emery powder, which is secured to the rblock by means of glue or any suitable ad- The sharpening block 15v tension of the follower 11 may may be removed from the casing and when one face has been worn it may be reversed to use the opposite face. When the sharpen-k ing block 15 is positioned in the casing7 and the casing 7 is applied to the mower, the y abrasive face of the sharpening block occupies ythe edges of the blades 3 may contact or engage with the same when the bladesare revolved in the operation of the mower over the surfaceof the ground. I In other words,

the sharpening block 15y is adapted to yield-r` ingly engage the edges of the blades of the mowerV as the blades are revolved. By being. ble tovary and consequently the grinding block 15 resting againstthe follower, the pressure of the grinding. block` against the edges of the blades may be regulated.

Inthe operation of my Sharpener, it is applied toA thef'mower as described without removing or changing any of the parts of the mower, and lby `operating the mower 'forwardly the brought into contact wit .the V grinding substantially a vertical position, so that the tension of the follower blades of the mower are block, and the sharpening of the blades is effected, and when the sharpening of the blades has been completed, the Sharpener' is easily and readily removed from the mower by loosening the set screws 9.

My improved sharpener is easily and readily attached to and detached from a mower, is simple in construction, and by its use I have been enabled to sharpen a mower quickly and successfully.

I claim:

A Sharpener for lawn mowers, comprising a casing having its front wall removed, opposite depending perforated ears at the ends of said casing, screws threaded through said ears for attaching and detaching said casing to and from the mower frame, a follower located in said casing, screw-threaded pins carried by said follower, springs mounted on said screw-threaded pins, thumb-nuts located on said screw-threaded pins for regulating the tension of said springs, and a removable and reversible sharpening block located in said casing in Contact with said follower.

In testimony whereof, I have signed my name to this speciication, in presence of two subscribing witnesses.

MIKKEL JOHANSEN.

Witnesses:

EDWARD E. LONGAN, E. L. WALLACE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

